Compared to conventional attenuation x-ray radiographic imaging, the x-ray Talbot-Lau technique provides further information about the scattering and the refractive properties of the object in the beam path. Hence, this additional information should improve the diagnostic process concerning medical applications and non-destructive testing. Nevertheless, until now, due to grating fabrication process, Talbot-Lau imaging suffers from small grating sizes (70 mm diameter). This leads to long acquisition times for imaging large objects. Stitching the gratings is one solution. Another one consists of scanning Talbot-Lau setups. In this publication, we present a compact and very fast scanning setup which enables imaging of large samples. With this setup a maximal scanning velocity of 71.7 mm/s is possible. A resolution of 4.1 lines/mm can be achieved. No complex alignment procedures are necessary while the field of view comprises 17.5 × 150 cm2. An improved reconstruction algorithm concerning the scanning approach, which increases robustness with respect to mechanical instabilities, has been developed and is presented. The resolution of the setup in dependence of the scanning velocity is evaluated. The setup imaging qualities are demonstrated using a human knee ex-vivo as an example for a high absorbing human sample.
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机译：与常规衰减X射线射线照相成像相比，X射线Talbot-Lau技术可提供有关对象在光路中的散射和折射特性的更多信息。因此，这些附加信息应改善有关医疗应用和无损检测的诊断过程。尽管如此，直到现在，由于光栅的制造工艺，Talbot-Lau成像的光栅尺寸很小（直径70毫米）。这导致对大型物体成像的较长采集时间。拼接光栅是一种解决方案。另一个包括扫描Talbot-Lau设置。在本出版物中，我们介绍了一种紧凑且非常快速的扫描设置，可对大型样品进行成像。通过这种设置，最大扫描速度为71.7 mm / s。分辨率可以达到4.1线/毫米。当视场为17.5×150 cm 2 时，不需要复杂的对准程序。已经开发并提出了一种改进的关于扫描方法的重建算法，该算法提高了机械不稳定性方面的鲁棒性。根据扫描速度评估设置的分辨率。使用人体膝关节作为高吸收人体样品的示例来演示设置成像质量。
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